Eupatorium lancifolium

Distinguishing Features: leaves are relatively narrow.

Habitat: clay-based soils in open areas.

Geographic Distribution : relatively restricted distribution in Arkansas, Louisiana, and Texas .

Similar Species: closely resembling E. linearifolium and E. semiserratum, and often treated as a synonym of the latter; the three major leaf veins diverge at the very base of the blade in E. lancifolium (rather than having the two major lateral veins diverge from the midribe slightly above the base), and the phyllaries, involucral bracts, and disk corollas are all slightly larger in E. lancifolium than in the sympatric E. semiserratum.

Molecular Data : samples of E. lancifolium differ in the ITS sequence from all other species by a minimum of 10 bp changes (most similar is E. linearifolium). A single base deletion that is characteristic of E. lancifolium and helps to identify it (together with E. album) as a progenitor of E. spnov is shown in the pherogram.

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